Time Trends of PCDDs/DFs in Lake Biwa and Osaka Bay.
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概要
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It is important to know the transition of accumulation and sources of PCDDs/DFs from the past through to the present in order to consider effective measures for their control, estimate the effect and discuss their environmental behavior. This research analyzed the time trends of PCDDs/DFs from sediment core samples taken from Lake Biwa and Osaka Bay.<BR>The results indicated that the PCDDs/DFs contamination in sediment core samples from Lake Biwa observed in the middle of the 19<SUP>th</SUP> century and the concentration level considerably increased in the latter half of the 20<SUP>th</SUP> century. The sediment core samples also showed that concentration level peaked out about 1980 and has been lowered slightly or stabilized. The variation of the congener and homologue profiles and the primary components analysis showed that the PCDDs/DFs contamination has been derived not only by combustion but also by herbicides including CNP and PCP.
- 日本環境化学会の論文
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